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What can be filled in place of the question mark in the following table? Degree of hardness Nature of water 1 Extremely soft water 2 Very soft water 3 Soft water 9 ?

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What can be filled in place of the question mark in the following table?

Degree of hardness Nature of water

1 Extremely soft water

2 Very soft water

3 Soft water

9 ?

(a) Excessive hard water

(b) Reasonably soft water

(c) Very hard water

(d) Hard water

I got this question by my college professor while I was bunking the class.

The above asked question is from Chemical Characteristic of Water topic in portion Quality of Water of Environmental Engineering

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Best answer
The correct answer is (d) Hard water

Explanation: When the degree of hardness is 9, then it indicates the hard water. For excessive hard water, it is 15 and for very hard water, it is 11.

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